Display screen portion with transitional progress bar graphical user interface



FIG. 1 is a front view of the first image in the sequence for a display screen portion with transitional progress bar graphical user interface showing the new design;

FIG. 2 is a front view of the second image thereof;

FIG. 3 is a front view of the third image thereof;

FIG. 4 is a front view of the fourth image thereof;

FIG. 5 is a front view of the fifth image thereof;

FIG. 6 is a front view of the sixth image thereof;

FIG. 7 is a front view of the seventh image thereof; and,

FIG. 8 is a front view of the eighth image thereof.

The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1-8.

The process or period in which one image transitions to another forms no part of the claimed design.

The broken line showing the display screen vicinity of the icon is for illustrative purposes only and forms no part of the claimed design. 

CLAIM The ornamental design for a “display screen portion with transitional progress bar graphical user interface,” as shown and described. 